Which parts fail
Components named in complaints (engine, cooling system, oil leaks, timing chain, exhaust).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2010 Toyota Prius owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2010 Toyota Prius. The contact stated that while driving 60-65 MPH, the vehicle lost motive power and went into LIMP Mode. The coolant temperature and several unknown warning lights were illuminated, and the message "Check Hybrid System" was displayed. The contact pulled to the side of the road, where he disconnected and reconnected the battery to reset the Hybrid system. The contact was able to drive to the residence; however, the failure recurred. The contact used an OBD reader to retrieve diagnostic test code: P261B. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The contact related the failure to NHTSA Campaign Number: 18V684000 (Hybrid Propulsion System) however, the VIN was not included in the recall. The manufacturer was not made aware of the failure. The failure mileage was approximately 148,469.
The contact owns a 2010 Toyota Prius. The contact stated that while operating the vehicle, the vehicle suddenly stalled without warning. The vehicle was towed to an independent mechanic who diagnosed that the engine had overheated and blown the head gasket. The engine was replaced, and the failure was remedied. The manufacturer and local dealer were notified of the failure. The failure mileage was 164,912,
The contact owns a 2010 Toyota Prius. The contact stated that the vehicle was consuming an excessive amount of engine oil. There was no warning light illuminated. The vehicle was taken to the local dealer however, the vehicle was not diagnosed nor repaired. The manufacturer was contacted and informed of the failure. The approximate failure mileage was 220,000.
My problem began when I pressed my brakes and instead it accelerated. I thought maybe my foot slipped and didn't know what it meant. It happened again a few weeks later and then all of the dash lights went on that indicated that I had to have the big brake recall repair. Being that my car is past the 10 year warranty and past the extension for mileage, I had to pay out of pocket. This repair was done and upon receiving my car back, the gas mileage instantly began to drop. It went from averaging 42-48MPG in my town to 25-30MPG. I took it in the be looked at and they ensured me nothing was wrong with the car AT ALL. …
Traveling at freeway speed just after midnight, the "check engine" light came on. Less than one minute later, the "check hybrid system" alert came on, with an exclamation mark inside of a yellow triangle symbol displayed. The vehicle instantly had no power when the accelerator was depressed. The vehicle coasted to a stop and would not shift into drive. The vehicle was towed to our home. Upon delivering the vehicle to our home, the tow driver used an emergency battery jump start device and the vehicle was able to shift into drive and be driven into the garage. The 12 volt battery was replaced the next day and the vehicle no longer exhibited any disfunction. This was an unexpected event with no warning that the 12 volt battery was in need of replacement. …
Excessive Oil consumption, particularly with highway driving. I have had this car for about a year. I only noticed that the oil was nearly empty when the engine was shaking while idling at an intersection. No warning lights for oil pressure or level ever came on, it would occasionally "ding" for oil pressure, but barley long enough for me to even read what the warning was. By excessive, I mean VERY excessive. First oil change after only 3k, almost empty. Road trip, mainly highway only about 600 miles, nearly empty. If I top it off, I check it constantly. City driving (more electric) it may burn a quart every 1-2k miles, highway more. I had the EGR, manifold and plugs serviced/replaced, it improved slightly. I'm having more work done now, but after reading SO MANY similar complaints online, I find it hard to believe this isn't a recall. …
I own a 2010 Toyota Prius hybrid 4 door sedan. I am the second owner of the vehicle. I purchased it in 2018 from a used car dealer. The vehicle ran well up until 2022 where a "check hybrid warning would appear on the dashboard along with a yellow triangle and service engine light would come on and the vehicle accelerator would not respond and the car would have to glide to the side of the parkway. This problem would happen when the car speed is between 60-70mph. It is very dangerous to lose power on the highway because many times there is no where to pull over. In 2024 I changed the water pump because the fault code on the cars built in diagnostic code read error "P216B" which is the cars electrical water pump signal. I researched it on google and a lot of 2010 Prius owners are complaining of the same thing. Also the changed water pump from April 2024 died again in January 2025. …
A number of things have failed on this car. 1. The hybrid battery pack system shut down and warned that I needed to see a mechanic. My mechanic diagnosed that the hybrid invert was defective and causing the battery pack to fail. 2. When braking at both low and high speeds, the car increasingly struggles to come to a stop. When applying foot pressure, you can hear the pump winding - this occurs while at rest as well as when trying to slow the car down. There are times when applying the brake that the floor pedal will lock and cause the car to skid while barely reducing the speed of the car. I have had multiple near accident incidences as a result and put myself and others at risk. 3. …
2010 Prius started up in the garage 3 hours after being shut down. I am certain the car was NOT still running while we unloaded groceries from hatchback and left the garage. * Nothing was retrieved from the front seat so no accidental start could have occurred. * My son "heard it start" almost 3 hours after the vehicle had been shut off while in another room near the garage. * I heard nothing from the upstairs. * The Prius key fob was nowhere near the vicinity of the vehicle at the time it started nor was any person. In fact, both key fobs were upstairs and only the currently used 1 had a battery and was stored inside a tin so as to always know where it was. *Toyota executives were made aware of incident but essentially denied the Toyota could start without the key fob: "Toyota is not aware for any possible way for the vehicle to be started without the key."
Car slows down to a stop when driving on the freeway. With no power to accelerate, it makes it hard to get to the side of the road to be towed. Been to the dealer twice to address the problem, and was told that if I don't pay $200, that there is nothing they can do. Then when I did pay the money for evaluation, they told me the problem could be one of several things that would start the never-ending process of repairs that will keep me paying until they solve it. I would think that with a $200 code reading, that the dealers software could narrow it down to the exact repair needed. I mentioned to the dealer about the JOV update I had done earlier to the car, but dealer refuses to recognize that there is a recall on my vehicle, and that I needed to pay money(that I don't have) to do anything. My check hybrid system light and orange triangle comes on when the car dies
Engine complaints in other Prius years
Frequently asked questions
How common are engine problems on the 2010 Toyota Prius?
NHTSA has 173 complaints about the engine & cooling of the 2010 Toyota Prius, 6% of the model year's 2,823 complaints. The component named most often is engine (6 mentions).
Is there a recall for 2010 Toyota Prius engine problems?
No. NHTSA lists no engine & cooling recall for the 2010 Toyota Prius, though it has 10 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2010 Toyota Prius engine problems start?
Half of the complaints with a recorded mileage happened before about 95,000 miles, and 17% before 25,000 miles.
Is it dangerous?
Owners linked 5 crashes, 5 fires and 2 injuries to engine & cooling problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.